Using RFCs

im currently in a IS-Retail implementation (version 4.7*200) in a convenience client with 230 stores, this ones using SRS (Sap Retail Store) functionality.

Some issues about our scenario you should know:

- We are using ITS for the SRS;

- We don't have any middleware (we work with ftp and file integrations);

- All stores have PDC.

As i found in help.sap.com we have some RFCs allowing the integration with third-party provider for SAP Retail Store. We've agreed with the providers that they will develop the third-party system to invoke the RFCs.

So, my questions are:

1) Is this the best solution for our scenario??

2) What do i have to do in our side (SAP) to allow the third-party system integration??